The M1A1 is the same tank group with some improvements in valves and connections. The major change is the simplification of the wand by using a shorter barrel with no bend and simplified nozzle attached to the barrel not threaded. Pressure was slightly higher but without much increase in range

The M2A1-2 is the variation of the M2 modified during the Korean war period. These had straight sided backpack frames, vented gas caps, a cylinder sized regulator and a safety valve. These are much more common today than WWII models.

M3 Auxiliary Flamethrower

M3 Auxiliary Flamethrower

The M3 Auxiliary Flamethrower as used in Sherman and Stuart tanks during WWII. It would mount in the bow of the tank, and could be used interchangeably with the browning machine gun.